Add new defaults for infer-web.py & adjust english translation (#584)

* Adjust defaults of index and volume scale

* Adjust eng translation for index and volume envelope

i18n/en_US.json

@@ -21,9 +21,9 @@
     "特征检索库文件路径,为空则使用下拉的选择结果": "Path to the feature index file. Leave blank to use the selected result from the dropdown:",
     "自动检测index路径,下拉式选择(dropdown)": "Auto-detect index path and select from the dropdown:",
     "特征文件路径": "Path to feature file:",
-    "检索特征占比": "Search feature ratio:",
+    "检索特征占比": "Search feature ratio (controls accent strength, too high has artifacting):",
     "后处理重采样至最终采样率，0为不进行重采样": "Resample the output audio in post-processing to the final sample rate. Set to 0 for no resampling:",
-    "输入源音量包络替换输出音量包络融合比例，越靠近1越使用输出包络": "Use the volume envelope of the input to replace or mix with the volume envelope of the output. The closer the ratio is to 1, the more the output envelope is used:",
+    "输入源音量包络替换输出音量包络融合比例，越靠近1越使用输出包络": "Adjust the volume envelope scaling. Closer to 0, the more it mimicks the volume of the original vocals. Can help mask noise and make volume sound more natural when set relatively low. Closer to 1 will be more of a consistently loud volume:",
     "保护清辅音和呼吸声，防止电音撕裂等artifact，拉满0.5不开启，调低加大保护力度但可能降低索引效果": "Protect voiceless consonants and breath sounds to prevent artifacts such as tearing in electronic music. Set to 0.5 to disable. Decrease the value to increase protection, but it may reduce indexing accuracy:",
     "F0曲线文件, 可选, 一行一个音高, 代替默认F0及升降调": "F0 curve file (optional). One pitch per line. Replaces the default F0 and pitch modulation:",
     "转换": "Convert",

infer-web.py

@@ -1372,7 +1372,7 @@ with gr.Blocks() as app:
                             minimum=0,
                             maximum=1,
                             label=i18n("检索特征占比"),
-                            value=0.88,
+                            value=0.75,
                             interactive=True,
                         )
                     with gr.Column():
@@ -1388,7 +1388,7 @@ with gr.Blocks() as app:
                             minimum=0,
                             maximum=1,
                             label=i18n("输入源音量包络替换输出音量包络融合比例，越靠近1越使用输出包络"),
-                            value=1,
+                            value=0.25,
                             interactive=True,
                         )
                         protect0 = gr.Slider(